Thomas Alva Edison patents the phonograph

On 1878 February 19, Thomas Edison was granted a patent for his gramophone (phonograph). From the article:

"Thomas Alva Edison patents the phonograph
The technology that made the modern music business possible came into existence in the New Jersey laboratory where Thomas Alva Edison created the first device to both record sound and play it back. He was awarded U.S. Patent No. 200,521 for his invention–the phonograph–on this day in 1878.

Edison’s invention came about as spin-off from his ongoing work in telephony and telegraphy. In an effort to facilitate the repeated transmission of a single telegraph message, Edison devised a method for capturing a passage of Morse code as a sequence of indentations on a spool of paper. Reasoning that a similar feat could be accomplished for the telephone, Edison devised a system that transferred the vibrations of a diaphragm—i.e., sound—to an embossing point and then mechanically onto an impressionable medium—paraffin paper at first, and then a spinning, tin-foil wrapped cylinder as he refined his concept. Edison and his mechanic, John Kreusi, worked on the invention through the autumn of 1877 and quickly had a working model ready for demonstration. The December 22, 1877, issue of Scientific American reported that “Mr. Thomas A. Edison recently came into this office, placed a little machine on our desk, turned a crank, and the machine inquired as to our health, asked how we liked the phonograph, informed us that it was very well, and bid us a cordial good night.”

The patent awarded to Edison on February 19, 1878, specified a particular method—embossing—for capturing sound on tin-foil-covered cylinders. The next critical improvement in recording technology came courtesy of Edison’s competitor in the race to develop the telephone, Alexander Graham Bell. His newly established Bell Labs developed a phonograph based on the engraving of a wax cylinder, a significant improvement that led directly to the successful commercialization of recorded music in the 1890s and lent a vocabulary to the recording business—e.g., “cutting” records and “spinning wax”—that has long outlived the technology on which it was based."